(based on the arch wiki)
Let’s create an Linux Installer USB drive (also know as “flash drive”) for booting in BIOS and UEFI systems. The resulting flash drive system can be used for installing Arch Linux, system maintenance or recovery.
Find out the name of your USB drive with
[~] ➜ ls -l /dev/disk/by-id/usb-*
lrwxrwxrwx 1 root root 9 Aug 4 22:49 /dev/disk/by-id/usb-BUFFALO_USB_Flash_Disk_0718359D155F7A81-0:0 -> ../../sdb
lrwxrwxrwx 1 root root 10 Aug 4 22:49 /dev/disk/by-id/usb-BUFFALO_USB_Flash_Disk_0718359D155F7A81-0:0-part1 -> ../../sdb1Then write the iso file to the USB drive with dd:
[~] ➜ sudo dd bs=4M if=/path/to/file.iso of=/dev/sdX status=progress oflag=sync
822083584 bytes (822 MB, 784 MiB) copied, 64 s, 12.8 MB/s
197+1 records in
197+1 records out
827123712 bytes (827 MB, 789 MiB) copied, 64.406 s, 12.8 MB/sSee this website for other methods to write iso to USB drive.